docs: def _check_for_duplicate_sequence_names(self, fasta_file_path):
          """Test if the given fasta file contains sequences with duplicate
          sequence names.
  
          Parameters
          ----------
          fasta_file_path: string
              path to file that is to be checked
  
          Returns
          -------
          The name of the first duplicate sequence found, else False.
  
          """
          found_sequence_names = set()
          for record in SeqIO.parse(fasta_file_path, 'fasta'):
              name = record.name
              if name in found_sequence_names:
                  return name
              found_sequence_names.add(name)
          return False